<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<style>
    body{
        background: rgb(5,5,5) url("img/game_bg_2_hd.jpg") no-repeat center center fixed;
    }
    .banner{
        width:800px;
        height: 161px;
        background: url("img/fish10.png") no-repeat -10px 7px;
    }
    .banner:hover{
        width:179px;
        height: 190px;
        background: url("img/fish10.png") no-repeat 2px -170px;
    }
</style>
<body>
<a href="index.html">作业一</a>
<a href="demo.html">作业二</a>
<a href="new.html">作业三</a>
<div class="banner"></div>
</body>
</html>